As in all Melco PVC windows, our Alto patio door features an extruded multi-chamber frame for superior insulation and energy efficiency. The sliding panels are reinforced with aluminum for greater rigidity and structural integrity, which enhances the products robustness and durability. In addition, our innovative sliding-panel system uses adjustable tandem 1-inch rollers in stainless steel rails to ensure smooth and quiet operation.


Performance and benefits


- PVC panels and wood-frame cladding

- Smooth and quiet operation

- Aluminum-reinforced sashes

- Insulated decorative panel (Alto +)


Performance tests:

Air                   A3

Water              B3

Wind               C3

Forced entry   F2



Alto and Alto + patio doors